Improvement in platform-scales



H. J. DREW.

Platform Scale.

Patented Oct. 27, 1863.

- Ingeni Win/@6506 UNITED STATES PATENT ()FFICE.

HENRY J. DREIV, OF DIXON, ILLINOIS.

Specification forming part of Lrtters Patent No. 40,400, dated Ociobcr27,1863.

To all whom it may concern Be it known that I, HENRY J. DREW, of Dixon, in the county of Lee and State of Illinois, have invented a new and useful Improvement in Platform-Scales; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this specification, in which Figure 1 is a side view of my invention; Fig. 2, atransverse vertical section of the same, taken in the line 00 m, Fig. 1.

Similar letters of reference indicate corresponding parts in the two figures.

This invention relates to an improvement on a platform-scale, Letters Patent for which were granted to L. M. Severance, November 11, 1862. This scale of Severances possesses some advantages overothers in use. It can be economically constructed, is simple, and not liable to get out of repair; but it also possesses some disadvantages, to wit: The scalebeam is frequently in the way when large, loads are to be weighed, and the arrangement l of its levers is such that the scale is not a sensitive onetl1at is to say, the scale-beam does not readily respond to or act freely under the movement of the platform, and to remedy this the frame or box to which the platform is attached is loaded,and frequently quite heavily loaded.

My invention consists in connecting the balances or levers, which are connected with the platform-frame, to the scale-beam through the medium of levers arranged in such a manner as to effectually obviate the difficulties i above alluded to.

To enable those skilled in the art to fully understand and construct my invention, I will proceed to describe it. 1

A represents a frame, in which the levers and Working parts of the scale are placed, and B B are two pairs of levers, which are suspended by knife-edges a in the frame A, one J pair at each side of it. To these levers B a frame, 0, is suspended by knife-edges b, and on this frame the platform which receives the load to be weighed is secured. The innerends of the levers B B are provided each with a pendent pin, 0, and these pins are fitted in holes or recesses d in the outer parts of two levers, D D, which are placed between crossbars 6 e in the frame A, and work on fulcrumpinsf, as shown clearly in Fig. 2. The inner ends of the levers D D have each a link, g, attached to them, and the lower ends ofthese links are connected together and to the inner end of a lever, E, by means of a pin, h, said lever E being underneath one of the levers D and connected to the scale-beam F by means of a rod, G.

From the above description it will be seen that the frame 0 and platform may be very nicely balanced, and that the scale-beam F may be placed at any suitable distance from the platform by having the lever E of the re quired length and its fulcrum-pin i properly placed or adjusted in the lever. There is but little friction to overcome in the transmission of the weight or load on the platform to the scale-beam, and the platform-frame C does not require to be loaded in order to render the scale sensitive. I also am enabled to use iron levers D D E without interfering with the proper action and balancing of the platform.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

The employment or use of the levers D D E, in combination with the levers B B, arranged in connection with the platform-frame G and scale-beam F, substantially as and for the purpose herein set forth.

HENRY J. DREW.

\ vitnesses WILLIAH W. D. WOLF, E. PINKNEY. 

